20001181212 has 36 divisors (see below), whose sum is σ = 53219519080. Its totient is φ = 6316162272.

The previous prime is 20001181199. The next prime is 20001181223. The reversal of 20001181212 is 21218110002.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14620063 + ... + 14621430.

Almost surely, 2^20001181212 is an apocalyptic number.

It is an amenable number.

20001181212 is an abundant number, since it is smaller than the sum of its proper divisors (33218337868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20001181212 is a wasteful number, since it uses less digits than its factorization.

20001181212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29241522 (or 29241517 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20001181212 its reverse (21218110002), we get a palindrome (41219291214).

The spelling of 20001181212 in words is "twenty billion, one million, one hundred eighty-one thousand, two hundred twelve".